基于AHP-GRA新建隧道爆破对邻近铁路隧道振动影响研究

Study on vibration effect of blasting of new tunnel based on AHP-GRA method on adjacent railway tunnel

以金台铁路新建林家岙隧道为工程背景,为了科学、合理地控制新建隧道爆破施工对邻近运营铁路隧道的振动影响,采用AHP-GRA法对邻近运营隧道振动影响因素进行分析。将新建隧道爆破循环进尺的爆心距、总装药量、最大段药量和爆破循环进尺作为研究的相关因素变量,选取运营隧道迎爆侧测点振动速度、振动持续时间和振动主频作为系统的评价指标,结合现场实测数据,进行关联度计算并排序,得到邻近运营隧道综合振动影响因素的主次顺序,以及各评价指标与相关因素变量之间的关联度大小排序,其中最大段装药量和总药量对运营隧道总体振动影响最大;影响运营隧道振动主频的主要因素是最大段装药量和爆心距。AHP-GRA法的分析结果可为确定运营隧道振动影响因素的主次顺序提供科学的理论依据。

In order to scientifically and reasonably control the vibration influence of blasting construction of newly-built tunnels on adjacent railway tunnels,this paper uses AHP-GRA method to analyze the influencing factors of vibration of adjacent railway tunnels,taking the newly-built Linjiaao Tunnel of Jintai Railway as the engineering background.The distance of blasting center,the total charge,the maximum charge and the blasting cycle feed of new tunnel blasting were taken as the relevant variables in the study.The vibration velocity,duration and main frequency of the measured points on the explosion-prone side of the operating tunnel were selected as the evaluation indexes of the system.In addition,combined with the field measured data,the correlation degree was calculated and sorted,and the primary and secondary order of the factors affecting the comprehensive vibration of adjacent operating tunnels was obtained.The order of the correlation degree between each evaluation index and relevant variables was obtained.Among them,the maximum charge and the total charge have the greatest impact on the overall vibration of the operating tunnel.The main factors affecting the main frequency of vibration in operating tunnels are the maximum charge amount and the distance between the detonation centers.The results of AHP-GRA method can provide a scientific theoretical basis for determining the order of influencing factors of vibration of operating tunnels.